Figure 2
From: Advanced spectroscopy-based phenotyping offers a potential solution to the ash dieback epidemic
SIMCA 3D class projections. SIMCA 3D class projection plots for spectral data of Fraxinus excelsior leaf and twig bark tissue phenolic extracts analysed as a function of the resistance phenotype, but visualized according to either the sample geographic location or its resistance phenotype. Spectral data were pre-processed using the standard normal variate function and then smoothed and transformed into their second derivative. Two technical replicates were analysed separately. Clouds of black points indicate the 95% confidence interval for each class (i.e., resistance phenotypes) in each principal component direction (i.e., PC1, PC2 and PC3) projected into the three-factor principal component hyper-plane.
